.stu{
    width:775px;
    height: 520px;
    /* background:rgb(240,242,245); */
    background-color: white;
    margin-left:-30px;
    margin-top: 3px;
    border-radius: 5px;
    overflow: hidden;
    overflow:auto;
    position: relative;
    position: relative;
}
.stux{
    width: 220px;
    height: 50px;
    /* background-color: red; */
    position: absolute;
    top: 2px;
    left: 550px;
}
.stux>input{
   width: 140px;
   height: 25px;
   border: 1px solid rgb(181,181,181);
   border-radius: 5px;
   outline: none;
}
.stux>button{
    margin-left: 10px;
    width: 50px;
    height: 24px;
    border-radius: 5px;
    background-color: rgb(38,52,69);
    color: white;
    cursor: pointer;
}